I don't know how/why Ryo ended up so buff but there you go! He's a machine. Maybe it was to try and look good for Ami when they met up again. Too bad her type seems to be men so effeminate their gender could be swapped and nobody would know.

Pooooor Makoto. You may have saved his life and probably given him a little "birds and the bees" chat, but that doesn't mean you can go man-handling him.